土壤质地对单膜孔肥液入渗水分及氮素运移的影响
Influence of soil textures on transportation of water and nitrogen under single film hole infiltration of fertilizer solution
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摘要: 为了探求特定条件下的水肥运移规律，该文通过室内试验，研究了土壤质地对单膜孔肥液入渗水分运移及 NO-3 -N分布的影响。研究表明，不同土壤质地的单膜孔肥液入渗累积入渗量均符合Kostiakov入渗模型；水平湿润距离和垂直湿润距离随时间的变化均符合幂函数方程；质地对土壤含水率的分布和再分布的影响均较大；供水结束时，不同土壤质地的NO-3 -N含量在湿润土体表层10 cm范围内的高含水率段分布均比较均匀，且NO-3 -N含量相差较小；NO-3 -N本底值对湿润体表层10 cm范围内NO-3 -N含量分布和再分布的影响不大。Abstract: For searching the transport law of water and fertilizer under given conditions, based on lab experiment，the influences of soil textures on transport characteristics of water and distribution of NO-3 -N under single film hole infiltration of fertilizer solution were researched. The cumulative infiltration volume of soils with different textures followed the Kostiakov infiltration model. The relationships between transport distances of vertical and horizontal wetting fronts and infiltration time followed the power function equation. Soil texture had a significant influence on distribution and redistribution of soil water content. Distribution of the NO-3 -N contents of soils with different soil textures were relatively even and there were less difference on the NO-3 -N contents of soils at the 10 cm scope of upper wetting body with high water content at the end of water supply. The background value of NO-3 -N contents in soils with different textures had little influence on soil NO-3 -N distribution and redistribution at high water content section.
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Keywords:
- textures /
- film hole irrigation /
- infiltration /
- fertilizer solutions /
- water transportation /
- nitrogen
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